diff options
| author | Nicolas Lacasse <nlacasse@google.com> | 2020-05-06 10:28:50 -0700 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2020-05-06 10:30:18 -0700 |
| commit | 591ff0e424e3b30eb143bce06618cb8656784b90 (patch) | |
| tree | 46b63f822864e51c6ecbbe909f986e19fc0033df /pkg/sentry/syscalls | |
| parent | 8416da33d25bf28cfcfdcbe658f696d6883eebcd (diff) | |
Add maximum memory limit.
PiperOrigin-RevId: 310179277
Diffstat (limited to 'pkg/sentry/syscalls')
| -rw-r--r-- | pkg/sentry/syscalls/linux/sys_sysinfo.go | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/pkg/sentry/syscalls/linux/sys_sysinfo.go b/pkg/sentry/syscalls/linux/sys_sysinfo.go index a65b560c8..297de052a 100644 --- a/pkg/sentry/syscalls/linux/sys_sysinfo.go +++ b/pkg/sentry/syscalls/linux/sys_sysinfo.go @@ -29,13 +29,18 @@ func Sysinfo(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Sysca mf.UpdateUsage() _, totalUsage := usage.MemoryAccounting.Copy() totalSize := usage.TotalMemory(mf.TotalSize(), totalUsage) + memFree := totalSize - totalUsage + if memFree > totalSize { + // Underflow. + memFree = 0 + } // Only a subset of the fields in sysinfo_t make sense to return. si := linux.Sysinfo{ Procs: uint16(len(t.PIDNamespace().Tasks())), Uptime: t.Kernel().MonotonicClock().Now().Seconds(), TotalRAM: totalSize, - FreeRAM: totalSize - totalUsage, + FreeRAM: memFree, Unit: 1, } _, err := t.CopyOut(addr, si) |